Upper Shock Bolt 1986 C10

[BrookelynnGreen]

I was doing a rear end swap this weekend and encountered a problem with the bolt that holds the upper part of the shock to the frame. First I sprayed some liquid wrench type of stuff and waited a while before turning the nut. When I went to loosen the nut it broke right off... Where abouts can I find that particular bolt so I can finish the job?

PLEASE HELP

Once I get a new bolt, Ill just need to secure the upper part of the shock and fill the housing with differential fluid, bleed the brakes and test drive!!